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tinfoil patch: no array is written to in bulk before counts are 

validated; do not free frames that are not allocated; removed all of the
output modes that no one uses and only PAL8 remains

Originally committed as revision 4517 to svn://svn.ffmpeg.org/ffmpeg/trunk
tags/v0.5
Mike Melanson 20 years ago
parent
485bb00108
commit
ca16618b01
1 changed files with 85 additions and 419 deletions
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  1. +85
    -419
      libavcodec/xan.c

+ 85
- 419
libavcodec/xan.c View File

@@ -20,12 +20,11 @@

/**
* @file xan.c
* Xan video decoder for Wing Commander III & IV computer games
* Xan video decoder for Wing Commander III computer game
* by Mario Brito (mbrito@student.dei.uc.pt)
* and Mike Melanson (melanson@pcisys.net)
*
* The xan_wc3 decoder outputs the following colorspaces natively:
* PAL8 (default), RGB555, RGB565, RGB24, BGR24, RGBA32, YUV444P
* The xan_wc3 decoder outputs PAL8 data.
*/

#include <stdio.h>
@@ -35,77 +34,32 @@

#include "common.h"
#include "avcodec.h"
#include "dsputil.h"

#define PALETTE_COUNT 256
#define PALETTE_CONTROL_SIZE ((256 * 3) + 1)

typedef struct XanContext {

AVCodecContext *avctx;
DSPContext dsp;
AVFrame last_frame;
AVFrame current_frame;

unsigned char *buf;
int size;

unsigned char palette[PALETTE_COUNT * 4];

/* scratch space */
unsigned char *buffer1;
int buffer1_size;
unsigned char *buffer2;
int buffer2_size;

} XanContext;

/* RGB -> YUV conversion stuff */
#define SCALEFACTOR 65536
#define CENTERSAMPLE 128

#define COMPUTE_Y(r, g, b) \
(unsigned char) \
((y_r_table[r] + y_g_table[g] + y_b_table[b]) / SCALEFACTOR)
#define COMPUTE_U(r, g, b) \
(unsigned char) \
((u_r_table[r] + u_g_table[g] + u_b_table[b]) / SCALEFACTOR + CENTERSAMPLE)
#define COMPUTE_V(r, g, b) \
(unsigned char) \
((v_r_table[r] + v_g_table[g] + v_b_table[b]) / SCALEFACTOR + CENTERSAMPLE)

#define Y_R (SCALEFACTOR * 0.29900)
#define Y_G (SCALEFACTOR * 0.58700)
#define Y_B (SCALEFACTOR * 0.11400)

#define U_R (SCALEFACTOR * -0.16874)
#define U_G (SCALEFACTOR * -0.33126)
#define U_B (SCALEFACTOR * 0.50000)

#define V_R (SCALEFACTOR * 0.50000)
#define V_G (SCALEFACTOR * -0.41869)
#define V_B (SCALEFACTOR * -0.08131)
int frame_size;

/*
* Precalculate all of the YUV tables since it requires fewer than
* 10 kilobytes to store them.
*/
static int y_r_table[256];
static int y_g_table[256];
static int y_b_table[256];

static int u_r_table[256];
static int u_g_table[256];
static int u_b_table[256];

static int v_r_table[256];
static int v_g_table[256];
static int v_b_table[256];
} XanContext;

static int xan_decode_init(AVCodecContext *avctx)
{
XanContext *s = avctx->priv_data;
int i;

s->avctx = avctx;
s->frame_size = 0;

if ((avctx->codec->id == CODEC_ID_XAN_WC3) &&
(s->avctx->palctrl == NULL)) {
@@ -115,28 +69,14 @@ static int xan_decode_init(AVCodecContext *avctx)

avctx->pix_fmt = PIX_FMT_PAL8;
avctx->has_b_frames = 0;
dsputil_init(&s->dsp, avctx);

/* initialize the RGB -> YUV tables */
for (i = 0; i < 256; i++) {
y_r_table[i] = Y_R * i;
y_g_table[i] = Y_G * i;
y_b_table[i] = Y_B * i;

u_r_table[i] = U_R * i;
u_g_table[i] = U_G * i;
u_b_table[i] = U_B * i;

v_r_table[i] = V_R * i;
v_g_table[i] = V_G * i;
v_b_table[i] = V_B * i;
}

if(avcodec_check_dimensions(avctx, avctx->width, avctx->height))
return -1;
s->buffer1 = av_malloc(avctx->width * avctx->height);
s->buffer2 = av_malloc(avctx->width * avctx->height);
s->buffer1_size = avctx->width * avctx->height;
s->buffer1 = av_malloc(s->buffer1_size);
s->buffer2_size = avctx->width * avctx->height;
s->buffer2 = av_malloc(s->buffer2_size);
if (!s->buffer1 || !s->buffer2)
return -1;

@@ -156,13 +96,15 @@ static inline void bytecopy(unsigned char *dest, unsigned char *src, int count)
dest[i] = src[i];
}

static int xan_huffman_decode(unsigned char *dest, unsigned char *src)
static int xan_huffman_decode(unsigned char *dest, unsigned char *src,
int dest_len)
{
unsigned char byte = *src++;
unsigned char ival = byte + 0x16;
unsigned char * ptr = src + byte*2;
unsigned char val = ival;
int counter = 0;
unsigned char *dest_end = dest + dest_len;

unsigned char bits = *ptr++;

@@ -173,6 +115,8 @@ static int xan_huffman_decode(unsigned char *dest, unsigned char *src)
val = src[val - 0x17];

if ( val < 0x16 ) {
if (dest + 1 > dest_end)
return 0;
*dest++ = val;
val = ival;
}
@@ -186,12 +130,13 @@ static int xan_huffman_decode(unsigned char *dest, unsigned char *src)
return 0;
}

static void xan_unpack(unsigned char *dest, unsigned char *src)
static void xan_unpack(unsigned char *dest, unsigned char *src, int dest_len)
{
unsigned char opcode;
int size;
int offset;
int byte1, byte2, byte3;
unsigned char *dest_end = dest + dest_len;

for (;;) {
opcode = *src++;
@@ -201,9 +146,13 @@ static void xan_unpack(unsigned char *dest, unsigned char *src)
offset = *src++;

size = opcode & 3;
if (dest + size > dest_end)
return;
bytecopy(dest, src, size); dest += size; src += size;

size = ((opcode & 0x1c) >> 2) + 3;
if (dest + size > dest_end)
return;
bytecopy (dest, dest - (((opcode & 0x60) << 3) + offset + 1), size);
dest += size;

@@ -213,9 +162,13 @@ static void xan_unpack(unsigned char *dest, unsigned char *src)
byte2 = *src++;

size = byte1 >> 6;
if (dest + size > dest_end)
return;
bytecopy (dest, src, size); dest += size; src += size;

size = (opcode & 0x3f) + 4;
if (dest + size > dest_end)
return;
bytecopy (dest, dest - (((byte1 & 0x3f) << 8) + byte2 + 1), size);
dest += size;

@@ -226,9 +179,13 @@ static void xan_unpack(unsigned char *dest, unsigned char *src)
byte3 = *src++;

size = opcode & 3;
if (dest + size > dest_end)
return;
bytecopy (dest, src, size); dest += size; src += size;

size = byte3 + 5 + ((opcode & 0xc) << 6);
if (dest + size > dest_end)
return;
bytecopy (dest,
dest - ((((opcode & 0x10) >> 4) << 0x10) + 1 + (byte1 << 8) + byte2),
size);
@@ -239,6 +196,8 @@ static void xan_unpack(unsigned char *dest, unsigned char *src)
if (size > 0x70)
break;

if (dest + size > dest_end)
return;
bytecopy (dest, src, size); dest += size; src += size;
}
}
@@ -247,105 +206,6 @@ static void xan_unpack(unsigned char *dest, unsigned char *src)
bytecopy(dest, src, size); dest += size; src += size;
}

static void inline xan_wc3_build_palette(XanContext *s,
unsigned int *palette_data)
{
int i;
unsigned char r, g, b;
unsigned short *palette16;
unsigned int *palette32;
unsigned int pal_elem;

/* transform the palette passed through the palette control structure
* into the necessary internal format depending on colorspace */

switch (s->avctx->pix_fmt) {

case PIX_FMT_RGB555:
palette16 = (unsigned short *)s->palette;
for (i = 0; i < PALETTE_COUNT; i++) {
pal_elem = palette_data[i];
r = (pal_elem >> 16) & 0xff;
g = (pal_elem >> 8) & 0xff;
b = pal_elem & 0xff;
palette16[i] =
((r >> 3) << 10) |
((g >> 3) << 5) |
((b >> 3) << 0);
}
break;

case PIX_FMT_RGB565:
palette16 = (unsigned short *)s->palette;
for (i = 0; i < PALETTE_COUNT; i++) {
pal_elem = palette_data[i];
r = (pal_elem >> 16) & 0xff;
g = (pal_elem >> 8) & 0xff;
b = pal_elem & 0xff;
palette16[i] =
((r >> 3) << 11) |
((g >> 2) << 5) |
((b >> 3) << 0);
}
break;

case PIX_FMT_RGB24:
for (i = 0; i < PALETTE_COUNT; i++) {
pal_elem = palette_data[i];
r = (pal_elem >> 16) & 0xff;
g = (pal_elem >> 8) & 0xff;
b = pal_elem & 0xff;
s->palette[i * 4 + 0] = r;
s->palette[i * 4 + 1] = g;
s->palette[i * 4 + 2] = b;
}
break;

case PIX_FMT_BGR24:
for (i = 0; i < PALETTE_COUNT; i++) {
pal_elem = palette_data[i];
r = (pal_elem >> 16) & 0xff;
g = (pal_elem >> 8) & 0xff;
b = pal_elem & 0xff;
s->palette[i * 4 + 0] = b;
s->palette[i * 4 + 1] = g;
s->palette[i * 4 + 2] = r;
}
break;

case PIX_FMT_PAL8:
case PIX_FMT_RGBA32:
palette32 = (unsigned int *)s->palette;
memcpy (palette32, palette_data, PALETTE_COUNT * sizeof(unsigned int));
break;

case PIX_FMT_YUV444P:
for (i = 0; i < PALETTE_COUNT; i++) {
pal_elem = palette_data[i];
r = (pal_elem >> 16) & 0xff;
g = (pal_elem >> 8) & 0xff;
b = pal_elem & 0xff;
s->palette[i * 4 + 0] = COMPUTE_Y(r, g, b);
s->palette[i * 4 + 1] = COMPUTE_U(r, g, b);
s->palette[i * 4 + 2] = COMPUTE_V(r, g, b);
}
break;

default:
av_log(s->avctx, AV_LOG_ERROR, " Xan WC3: Unhandled colorspace\n");
break;
}
}

/* advance current_x variable; reset accounting variables if current_x
* moves beyond width */
#define ADVANCE_CURRENT_X() \
current_x++; \
if (current_x >= width) { \
index += line_inc; \
current_x = 0; \
}

static void inline xan_wc3_output_pixel_run(XanContext *s,
unsigned char *pixel_buffer, int x, int y, int pixel_count)
{
@@ -354,124 +214,27 @@ static void inline xan_wc3_output_pixel_run(XanContext *s,
int index;
int current_x;
int width = s->avctx->width;
unsigned char pix;
unsigned char *palette_plane;
unsigned char *y_plane;
unsigned char *u_plane;
unsigned char *v_plane;
unsigned char *rgb_plane;
unsigned short *rgb16_plane;
unsigned short *palette16;
unsigned int *rgb32_plane;
unsigned int *palette32;

switch (s->avctx->pix_fmt) {

case PIX_FMT_PAL8:
palette_plane = s->current_frame.data[0];
stride = s->current_frame.linesize[0];
line_inc = stride - width;
index = y * stride + x;
current_x = x;
while(pixel_count--) {

/* don't do a memcpy() here; keyframes generally copy an entire
* frame of data and the stride needs to be accounted for */
palette_plane[index++] = *pixel_buffer++;

ADVANCE_CURRENT_X();
}
break;

case PIX_FMT_RGB555:
case PIX_FMT_RGB565:
rgb16_plane = (unsigned short *)s->current_frame.data[0];
palette16 = (unsigned short *)s->palette;
stride = s->current_frame.linesize[0] / 2;
line_inc = stride - width;
index = y * stride + x;
current_x = x;
while(pixel_count--) {

rgb16_plane[index++] = palette16[*pixel_buffer++];

ADVANCE_CURRENT_X();
}
break;

case PIX_FMT_RGB24:
case PIX_FMT_BGR24:
rgb_plane = s->current_frame.data[0];
stride = s->current_frame.linesize[0];
line_inc = stride - width * 3;
index = y * stride + x * 3;
current_x = x;
while(pixel_count--) {
pix = *pixel_buffer++;

rgb_plane[index++] = s->palette[pix * 4 + 0];
rgb_plane[index++] = s->palette[pix * 4 + 1];
rgb_plane[index++] = s->palette[pix * 4 + 2];

ADVANCE_CURRENT_X();
palette_plane = s->current_frame.data[0];
stride = s->current_frame.linesize[0];
line_inc = stride - width;
index = y * stride + x;
current_x = x;
while((pixel_count--) && (index < s->frame_size)) {

/* don't do a memcpy() here; keyframes generally copy an entire
* frame of data and the stride needs to be accounted for */
palette_plane[index++] = *pixel_buffer++;

current_x++;
if (current_x >= width) {
index += line_inc;
current_x = 0;
}
break;

case PIX_FMT_RGBA32:
rgb32_plane = (unsigned int *)s->current_frame.data[0];
palette32 = (unsigned int *)s->palette;
stride = s->current_frame.linesize[0] / 4;
line_inc = stride - width;
index = y * stride + x;
current_x = x;
while(pixel_count--) {

rgb32_plane[index++] = palette32[*pixel_buffer++];

ADVANCE_CURRENT_X();
}
break;

case PIX_FMT_YUV444P:
y_plane = s->current_frame.data[0];
u_plane = s->current_frame.data[1];
v_plane = s->current_frame.data[2];
stride = s->current_frame.linesize[0];
line_inc = stride - width;
index = y * stride + x;
current_x = x;
while(pixel_count--) {
pix = *pixel_buffer++;

y_plane[index] = s->palette[pix * 4 + 0];
u_plane[index] = s->palette[pix * 4 + 1];
v_plane[index] = s->palette[pix * 4 + 2];

index++;
ADVANCE_CURRENT_X();
}
break;

default:
av_log(s->avctx, AV_LOG_ERROR, " Xan WC3: Unhandled colorspace\n");
break;
}
}

#define ADVANCE_CURFRAME_X() \
curframe_x++; \
if (curframe_x >= width) { \
curframe_index += line_inc; \
curframe_x = 0; \
}

#define ADVANCE_PREVFRAME_X() \
prevframe_x++; \
if (prevframe_x >= width) { \
prevframe_index += line_inc; \
prevframe_x = 0; \
}

static void inline xan_wc3_copy_pixel_run(XanContext *s,
int x, int y, int pixel_count, int motion_x, int motion_y)
{
@@ -481,123 +244,31 @@ static void inline xan_wc3_copy_pixel_run(XanContext *s,
int curframe_x, prevframe_x;
int width = s->avctx->width;
unsigned char *palette_plane, *prev_palette_plane;
unsigned char *y_plane, *u_plane, *v_plane;
unsigned char *prev_y_plane, *prev_u_plane, *prev_v_plane;
unsigned char *rgb_plane, *prev_rgb_plane;
unsigned short *rgb16_plane, *prev_rgb16_plane;
unsigned int *rgb32_plane, *prev_rgb32_plane;

switch (s->avctx->pix_fmt) {

case PIX_FMT_PAL8:
palette_plane = s->current_frame.data[0];
prev_palette_plane = s->last_frame.data[0];
stride = s->current_frame.linesize[0];
line_inc = stride - width;
curframe_index = y * stride + x;
curframe_x = x;
prevframe_index = (y + motion_y) * stride + x + motion_x;
prevframe_x = x + motion_x;
while(pixel_count--) {

palette_plane[curframe_index++] =
prev_palette_plane[prevframe_index++];

ADVANCE_CURFRAME_X();
ADVANCE_PREVFRAME_X();
}
break;

case PIX_FMT_RGB555:
case PIX_FMT_RGB565:
rgb16_plane = (unsigned short *)s->current_frame.data[0];
prev_rgb16_plane = (unsigned short *)s->last_frame.data[0];
stride = s->current_frame.linesize[0] / 2;
line_inc = stride - width;
curframe_index = y * stride + x;
curframe_x = x;
prevframe_index = (y + motion_y) * stride + x + motion_x;
prevframe_x = x + motion_x;
while(pixel_count--) {

rgb16_plane[curframe_index++] =
prev_rgb16_plane[prevframe_index++];

ADVANCE_CURFRAME_X();
ADVANCE_PREVFRAME_X();
}
break;

case PIX_FMT_RGB24:
case PIX_FMT_BGR24:
rgb_plane = s->current_frame.data[0];
prev_rgb_plane = s->last_frame.data[0];
stride = s->current_frame.linesize[0];
line_inc = stride - width * 3;
curframe_index = y * stride + x * 3;
curframe_x = x;
prevframe_index = (y + motion_y) * stride +
(3 * (x + motion_x));
prevframe_x = x + motion_x;
while(pixel_count--) {

rgb_plane[curframe_index++] = prev_rgb_plane[prevframe_index++];
rgb_plane[curframe_index++] = prev_rgb_plane[prevframe_index++];
rgb_plane[curframe_index++] = prev_rgb_plane[prevframe_index++];

ADVANCE_CURFRAME_X();
ADVANCE_PREVFRAME_X();
}
break;

case PIX_FMT_RGBA32:
rgb32_plane = (unsigned int *)s->current_frame.data[0];
prev_rgb32_plane = (unsigned int *)s->last_frame.data[0];
stride = s->current_frame.linesize[0] / 4;
line_inc = stride - width;
curframe_index = y * stride + x;
curframe_x = x;
prevframe_index = (y + motion_y) * stride + x + motion_x;
prevframe_x = x + motion_x;
while(pixel_count--) {

rgb32_plane[curframe_index++] =
prev_rgb32_plane[prevframe_index++];

ADVANCE_CURFRAME_X();
ADVANCE_PREVFRAME_X();
}
break;

case PIX_FMT_YUV444P:
y_plane = s->current_frame.data[0];
u_plane = s->current_frame.data[1];
v_plane = s->current_frame.data[2];
prev_y_plane = s->last_frame.data[0];
prev_u_plane = s->last_frame.data[1];
prev_v_plane = s->last_frame.data[2];
stride = s->current_frame.linesize[0];
line_inc = stride - width;
curframe_index = y * stride + x;
curframe_x = x;
prevframe_index = (y + motion_y) * stride + x + motion_x;
prevframe_x = x + motion_x;
while(pixel_count--) {

y_plane[curframe_index] = prev_y_plane[prevframe_index];
u_plane[curframe_index] = prev_u_plane[prevframe_index];
v_plane[curframe_index] = prev_v_plane[prevframe_index];

curframe_index++;
ADVANCE_CURFRAME_X();
prevframe_index++;
ADVANCE_PREVFRAME_X();

palette_plane = s->current_frame.data[0];
prev_palette_plane = s->last_frame.data[0];
stride = s->current_frame.linesize[0];
line_inc = stride - width;
curframe_index = y * stride + x;
curframe_x = x;
prevframe_index = (y + motion_y) * stride + x + motion_x;
prevframe_x = x + motion_x;
while((pixel_count--) && (curframe_index < s->frame_size)) {

palette_plane[curframe_index++] =
prev_palette_plane[prevframe_index++];

curframe_x++;
if (curframe_x >= width) {
curframe_index += line_inc;
curframe_x = 0;
}
break;

default:
av_log(s->avctx, AV_LOG_ERROR, " Xan WC3: Unhandled colorspace\n");
break;
prevframe_x++;
if (prevframe_x >= width) {
prevframe_index += line_inc;
prevframe_x = 0;
}
}
}

@@ -613,7 +284,9 @@ static void xan_wc3_decode_frame(XanContext *s) {
int x, y;

unsigned char *opcode_buffer = s->buffer1;
int opcode_buffer_size = s->buffer1_size;
unsigned char *imagedata_buffer = s->buffer2;
int imagedata_buffer_size = s->buffer2_size;

/* pointers to segments inside the compressed chunk */
unsigned char *huffman_segment;
@@ -626,10 +299,11 @@ static void xan_wc3_decode_frame(XanContext *s) {
vector_segment = s->buf + LE_16(&s->buf[4]);
imagedata_segment = s->buf + LE_16(&s->buf[6]);

xan_huffman_decode(opcode_buffer, huffman_segment);
xan_huffman_decode(opcode_buffer, huffman_segment, opcode_buffer_size);

if (imagedata_segment[0] == 2)
xan_unpack(imagedata_buffer, &imagedata_segment[1]);
xan_unpack(imagedata_buffer, &imagedata_segment[1],
imagedata_buffer_size);
else
imagedata_buffer = &imagedata_segment[1];

@@ -727,13 +401,6 @@ static void xan_wc3_decode_frame(XanContext *s) {
}
}
}

/* for PAL8, make the palette available on the way out */
if (s->avctx->pix_fmt == PIX_FMT_PAL8) {
memcpy(s->current_frame.data[1], s->palette, PALETTE_COUNT * 4);
s->current_frame.palette_has_changed = 1;
s->avctx->palctrl->palette_changed = 0;
}
}

static void xan_wc4_decode_frame(XanContext *s) {
@@ -745,16 +412,6 @@ static int xan_decode_frame(AVCodecContext *avctx,
{
XanContext *s = avctx->priv_data;
AVPaletteControl *palette_control = avctx->palctrl;
int keyframe = 0;

if (palette_control->palette_changed) {
/* load the new palette and reset the palette control */
xan_wc3_build_palette(s, palette_control->palette);
/* If pal8 we clear flag when we copy palette */
if (s->avctx->pix_fmt != PIX_FMT_PAL8)
palette_control->palette_changed = 0;
keyframe = 1;
}

if (avctx->get_buffer(avctx, &s->current_frame)) {
av_log(s->avctx, AV_LOG_ERROR, " Xan Video: get_buffer() failed\n");
@@ -762,6 +419,14 @@ static int xan_decode_frame(AVCodecContext *avctx,
}
s->current_frame.reference = 3;

if (!s->frame_size)
s->frame_size = s->current_frame.linesize[0] * s->avctx->height;

palette_control->palette_changed = 0;
memcpy(s->current_frame.data[1], palette_control->palette,
AVPALETTE_SIZE);
s->current_frame.palette_has_changed = 1;

s->buf = buf;
s->size = buf_size;

@@ -789,7 +454,8 @@ static int xan_decode_end(AVCodecContext *avctx)
XanContext *s = avctx->priv_data;

/* release the last frame */
avctx->release_buffer(avctx, &s->last_frame);
if (s->last_frame.data[0])
avctx->release_buffer(avctx, &s->last_frame);

av_free(s->buffer1);
av_free(s->buffer2);


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